lO HiCKLING, Aiiatojiiy of CalainostacJiys Biniicyana. 



The remaining point to be mentioned is the vascular 

 supply of the bracts. In one transverse section in the 

 Manchester Museum collection, this is extremely well 

 shown (R. 120), and it is interesting to note that the 

 traces do not come off quite symmetrically from the four 



Fig. 3. 



Transverse section through rode, immediately below bracts, showing 

 origin of bract-traces. Note that each bundle appears to give off 

 its traces somewhat unsymmetrically. 

 X 36 dia. 



Manchr, Museum Coll. R. 120. 



bundles present (of which three each supply three traces, 

 the other, four), as may be seen in the accompanying 

 figure {Fig. 3), where the traces appear as if dragged 

 round by a slight anti-clockwise movement. This slight 

 asymmetry is in agreement with what appears to me to 

 be the only possible explanation of a well-known difficulty 

 in the morphology of this cone — viz., the combination of 

 superposed sporangiophores and non-alternating bundles, 

 with alternating bracts. The relation of the sporangio- 

 phores with the bundles is very definite — each bundle 

 stands opposite a pair of sporangiophores ; and it appears 



